Speed-changing gearing.



J. H. McELROY. SPEED CHANGING GEARING.

APPLICATION FILED DEC. 5. 1910.

Patented Dec. 28, 1915.

4 SHEETS-SHEET I.

J. H. MCELROY. SPEED CHANGING GEARING.

APPLICATION FILED DEC. 5,1910- Y 1,165,426. Patented Dec. 28, 1915.

4 SHEETSSHEET 2.

.B T l l I 70 (film/ 27921 wwww Jazz 76915435! W COLUMBIA PLANOGRAPH CO.,WASI1INGTON. 0.1:.

J. H. McELROY. SPEED CHANGING GEARING.

. APPLICATION FILED DEC. 5, IQIO. 1,165,426, Patented Dec. 28, 1915.

4 SHEETS-SHEET 3.

'l li iifjll COLUMBIA PLQIOGRAPH co.. WASHINGTON. D. cv

J. H. McELROY. SPEED CHANGING GEARING. APPLICATION FILED DEC. 5. 1910.

Patented Dec. 28, 1915.

4 SHEETS-SHEET 4.

COLUMBIA PLANOORAPH c0, WASHINGTOMD. c.

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JOHN HOWARD McELBOY, OF CHICAGO, ILLINOIS.

SPEED-CHANGING GEARING.

incense.

Specification of Letters Patent.

Patented Dec. 28, 1915.

Application filed December 5, 1910. Serial No. 595,670.

a resident of Chicago, in the county of Cook and State oflllinois, have invented certain new and useful Improvements in Speed-Changing Gearing, of which the following 1 s a full, clear, and exact specifi tion. M

My invention is concerned with a novel speed-changing or transmission gearing designed primarily for automobiles, the fundamentally novel feature of which comprises a friction disk cooperating with an expansible wheel which can be shifted across the face of the disk to vary the speed when it is contracted, and which can be quickly expanded to start the gearing and contracted to stop it.

In connection with my novel speedchanging gearing, I preferably employ an annulus connected with the driving or engine shaft, so that for high speed the eX- pansible wheel may be shifted into the annulus and clutched thereto so as to have a direct drive.

My invention is further. concerned with certain novel details of construction and novel combinations by which the essentially novel combination before described may be best utilized.

To illustrate my invention, I annex hereto four sheets of drawings, in which the same reference characters are used to designate identical parts in all the figures,

of which,- I

Figure 1 IS a too plan view of the gearing with a portion thereof in central horlzontal section; Fig. 2 is a sectional view of the same in side elevation, with some of the front parts broken out to show the parts behind them; Fig. 3 is a vertical section on a smaller scale, substantially on the line A-A of Fig. 2; Fig. l is a similar view in sectionon the line BB of Fig. 2; Fig. 5 is an enlarged view of the expanding wheel, with the rear face plate removed to more clearly show the internal construction; Fig.

- 6 is a section on the line CC of Fi 5- Fig. 7 is a detail in section on the line D.D

of Fig. 5; Fig. 8 is a plan view of a portion of the periphery of the expanding wheel,

showing a possible modification; Fig. 9 is aside elevation, partly in section and broken away, showing a modification of the structure for disengaging the transmission disks from the driving wheel; Fig. 10 is a top plan view of the modification shown in Fig. 9, with one part of the mechanism in central horizontal section; and Fig. 11

is a detached view in side elevation of the pedal rock shaft shown in Fig. 10.

In carrying out my invention as applied to automobiles, I mount an engine 10 on the channel bars 11, constituting the side portion of the frame, and at suitable points I connect the channel bars by the generally U-shaped bearing frames 12 and 13, the frame 13 being shown in Fig. 4:.

Upon the end of the engine shaft 14:, I secure the fly wheel 15, and secured upon this fly wheel 15 is a friction annulus 16 which has the friction surface 17, which may be beveled as shown, and engages, if it is beveled, with a correspondingly beveled friction surface 18 on a transmission disk 19. This transmission disk 19 is preferably constructed of some suitable friction driving material, such as compressed fiber, and screwed on the end of the bearing shaft 20, and rests against the hub or spider 21, on which it can be secured in different positions of adjustment by screws 22, which are adapted to cooperate with difierent screw holes in the back of the disk 19, this threaded adjustment of the disk 19 on the spider 21 being provided in order to take up wear on the bearing surfaces of the disk. The shaft 20 is journaled in a suitable bearing 28. With the construction thus far described, it will be obvious that as the driving or fly wheel 15 is rotated, the friction surface 17 of the annulus 16 carried thereby will drive the transmission disk 19 in a certain direction at a speed corresponding to the speed of the engine.

Journaled in a bearing 24, which bearing maytake the form of a suitable metal sleeve secured in the hub of the fly wheel 15, is the driven shaft 25, the other end of which is journaled in a bearing 26 in the frame 13. This shaft 25 has a spline 27 thereon for substantially its entire length, and its other end has a universal joint 28, or, some othet suitable connection by which the power of the driven shaft may be transmitted through the shaft 29 to the differential on the rear axle, or on any other suitable driving connections with the traction wheels. The expanding wheel 30 is best shown in Figs. 5, 6 and 7, and will be seen to consist of a disk 31 integrally formed with or rigidly secured to a sleeve 32, which has the splined groove 33 by which it is slidingly but rotatably connected with the shaft 25. On the other end of the sleeve is an annularly grooved collar 34 adapted to be engaged by a split ring 35, which is provided at its sides with pins 36 entering elongated grooves 37 in the lower ends of the arms 38, which are secured on the rock shaft 39 journaled in bearings 40-and 41 secured on the tops of the channel bars 11. The rock shaft 39 has secured thereon an arm 42 which is connected by a link 43 with an arm 44 secured on the sleeve 45, which is journaled on the rock shaft 46 mounted in bearings 47 and 48 mounted on the channels 11,

the sleeve 45 being, in fact, extended through the bearing 48 so that the rock shaft 46 is not journaled directly, but indirectly, in the bearing 48. On the outer end of the sleeve 45 is secured the operating lever 49, which has the handle 50 adapted to slide on the lever 49 and provided with the connecting piece 51 extending to the sleeve 52 sliding on the lower end of the lever and provided with the tooth 53 adapted to cooperate with the different teeth of the segment 54 which may form a part of the bearing casting 48. By shifting the lever 49 to different positions on the segment, it will be apparent that the expanding wheel 30 can be shifted to different points across the face ofthe disk 19, and thus vary the relative speeds of the driving shaft 14 and the driven shaft 25 as may be desired, and it will, of course, be understood that after the expanding wheel 30 passes the center of the disk 19, the direction of rotation of the shaft 25 will be reversed without changin the direc tion of rotation of the engine shaft 14.

Returning now to the construction of the expanding wheel 30, it will be seen that it has secured thereon next to the disk 31 the star-shaped casting '55, which is formed with a plurality, say six, of pockets 56 bored therein, and adapted to receive the cylindrical plugs 57, which preferably rest on the rubber cushions 58 placed in the bottom the lever sections 62. Each lever section is two-armed, and pivoted in the vertical arm is the link 63, which is pivoted between suitable bearing surfaces 64 formed in periphof the disk 31 and the opposing disk 70, which is spaced from the disk 31 by thev posts 71, and secured thereto by screws 72 screwed through the disk 70 and into the- I 7 posts 71. The horizontal arm- 73 of the lever section 62 is bifurcated as shown, and

has pivoted therein a link 74, which in turn is pivoted in suitable bearings in the'collar 75 adapted to slide on the sleeve 32 and provided with an annular groove7 6. With the arrangement shown, it will-be apparent that when the collar 75 is slid onrthe sleeve 32 into engagement with the collar 34,'as shown in dotted lines in Fig. 6, theperipheral-seg ments 65 will be withdrawn out of engagement with the transmission disk 19,-and it will be equally apparent that when the collaris moved into the position shown in'full lines in Fig. 6, the segments 65 will be expanded against the face of the disk 19, and the part-Swill be locked in this position by reason of the fact that the links 74 pass their vertical position. To shift this collar 75, I associate therewith the split ring 76, whichhas pins .77 projecting into elongated slots 78 in the arms 79 secured on the rock shaft 80 journaled in bearings 81 and 82. v

Secured on the rock shaft 80 is a third shorter arm 83, which is connected by the link 84 with the arm 85 pinned on the shaft 3 46 adjacent the end of the sleeve 45 and furnishing a stop, as it were, for one end of the ll l. a

the handle 50. WVith this arrangement, with V the handle in the position shown in Fig. 2,

it will be readily apparent that the lever 49 7 can be swung from the extreme position shown insaid figure to a corresponding position in which the expanding wheel engages the friction disk 19 on the other side of its center, and that when it is moved to the desired adjustment, if the handle 50 is'pushed down on the lever 49, the cam slot 88 acting 011 the pin 87 will serve to rock the arm 86, the shaft 46, and through its connections the shaft 80 sufficiently so that the collar 75 will be shifted from the dotted-line. to the full-line position of Fig. 6, this actionserving to expand the wheel to start the rotation of the shaft 25.

It will be noted that the i can be moved down into the notches 90 and- 91 to the left of the notch 89 far enough to engage the expanding wheel with the transmission disk in either of these two positions ofadjustment, the first of which will give a slow backward drive, whilethe second will give a faster backward drive. Similarly, the tooth 53 can be depressed into the notches 92 and 93 to the right of the notch 89 far enough to engage the expanding wheel with the transmission disk for the two forward frictional drives at the two different speeds. The segment is, of course, provided with the'stops 9d and 95 at its ends to prevent the lever being swung beyond the desired limits. v

While I have heretofore described my invention as embodied in a construction in which a single transmission disk 19 is employed, 1 preferably duplicate the same and itsbearing on the other side of the expanding wheel in the manner which will be readily apparent from an inspection of the drawings, the duplicated parts being indicated by the same reference characters with the prime added.

In the embodiment of my invention thus far described, the drive at all speeds is a frictional drive, but in carrying out my invention I prefer to arrange it so that the drive at the highestspeed is a direct drive, that is not dependent on the frictional engagement of the expanding wheel with the transmission disk, and to this end 1 form or secure on the fly wheel or engine shaft an annular clutch or engaging surface of a di ameter substantiallyequal to the distance between the disks '19 and 19, and this annular surface 96 is preferably formed on the interior of the friction annulus 16, and it will be readily apparent that when the eX panding wheel is shifted to its extreme lefthand position, it will enter the annulus, the outer inner edge of which is slightly beveled, as seen at 97, to permit the ready entrance 'of the disk. When it has been shoved into the annulus, if it is then expanded by the movement of the handle 50, it will be apparent that the driven shaft 25 is then clutched directly to the engine shaft 14:, so that we have a direct drive at the highest speed. When the gearing is to be disconnected or the speed changed, the handle 50 will be pulled out to contract the disk, thus uncoupling the shafts 14 and 25 and permitting the movement of the expanding wheel to some point on the face of the transmission disk 19 if it is desired to change the speed or reverse the direction of movement. While I might leave the disks 19 and 19 always in frictional engagement with the wheel 16, this would cause an unnecessary wear on the bearings and periphery of the friction disk, and therefore I preferably provide means for slightly separating the friction disks and the wheel 16 when the apparatus is running on the direct drive, and 1 may procure this separation either by shifting the position of the disks 19 and 19 away from the wheel 16, or I may shift the wheel 16 away from the disks 19 and 19.

In Figs. 1 to 3 of the drawings, 1 show a construction in which the transmission disks are shifted away from the friction wheel or annulus 16, and for this purpose I form each of the bearings 23 and 23 on a casting which has a pair of elongated bearing sleeves 98 and 98" which are adapted to slide back and forth on the rods 99 and 99 extending between the frames 12 and 13. Pivoted in the casting between the righthand ends of the bearing sleeves is a link 100 which has its outer end threaded and passed through the yoke collar 101, in the outer end of which is pivoted the link 102, the other end of which is pivoted between the ears 103 formed on the casting 13. A helically-coiled expanding spring 104 is interposed between the shoulder on the link 100 and the yoke collar 101, and a set nut 105 is screwed on the threaded end of the link 100 within the yoke portion of the collar 101. Pivoted on the same pin that pivotally connects the yoke collar 101 with the link 102 is a vertical link 106, the lower end of which is pivoted to an arm 107 secured on the rock shaft 108 journaled in suitable bearings formed on the bearing casting 103. Secured on this same rock shaft 108 is a lever 109, on the forward end of which is pivoted a. rod 1 10 extending up through the floor of the machine and terminating in a pedal 111, and

'pivotally connected to the other end of the lever 109 is a similar rod 112 passing up through the floor of the machine and terminating in a pedal 118. A helically-coiled expanding spring 114 is interposed between the bearing sleeve 115 through which the rod 112 passes and the set collar 116 on the rod 112. Vith the construction herein shown, if the pedal 111 is depressed, it will be seen that the resultant rocking of the shaft 108 will cause the link 106 to be drawn down to straighten out the joint formed by the links 100 and 102, and this action will force the sleeves 98 forward, carrying the disks 19 and 19' into engagement with the friction annulus 16, and the yoke collar 101 sliding 011 the link 100 will put the spring 104 under tension so as to hold the periphcries of the friction disks in engagement running on the friction and not the direct with the friction annulus 16 by spring pressure. This, of course, will be the position of the friction disks when the machine is drive. When it isdesired to operate the machine on the direct drive, and the parts are shifted sufficiently for that purpose, the pedal 113 is depressed, and this rocking the shaft 108 in the opposite direction breaks the toggle joints and causes the friction disks to be drawn back out of engagement with the friction annulus 16, and the spring 111 is provided to prevent the inertia of the car from carrying the friction wheels forward into engagement with the friction annulus when the car stops, as the spring 114 is strong enough to hold the friction disks back from the friction annulus, although not offering serious resistance to the moving of the disks forward intentionally and locking them in thls forward movement by the action of the straightened joints.

In Figs. 9, and 11, I have illustrated one embodiment of the alternative form of my invention, in whichthe friction. annulus carried by the fly wheel is shifted, and in this form the engine shaft 1 1 has the hub of the fly wheel splined thereon so as to be capable of a slightmovement backward. and forward on the shaft. The driven shaft as before, has its inner end with a bearin in the sleeve 24 which is carried in the fly wheel will preferably be in its rearward-position, so that the friction disks 18 and 18? will not be driven while the machine is running on the direct drive. In this case, the bearings 23 and 23 for the shafts 20 and 20 of the friction disks 18 and 18 are stationary, as there is no occasion to make them movable, and they are formed in the casting 12 the position of which is shifted, as shown, to be in line with the bearings.

The mechanism for shifting the fly wheel 15 is best shown in Figs. 9 and 10, where it ,will be seen that I provide a bearing 117 for a vertical rock shaft 118, the upper end of which has a bearing pin 119 set slightly eccentric with the shaft 118, and has journaled thereon the bearing roller 120, which coeperates with an annular groove formed on one side by the slip ring 121 and on the other side by the locking collar 122, which'is screwed on the reduced threaded end 123 of the hub of the fly Wheel 15, and takes against the threaded collar 124, likewise.

screwed on said reduced end, 7 A slip ring 125 rests against the unreduced portion of the hub, and aset of anti-friction-balls or rollers 126 interposed between the slip rings 7 121 and 125 serves to permit the rapid'ro tation of the fly wheel without transmitting a great deal of the rotation to the roller 120.

The lower end of the shaft 118'has secured thereon the crank arm 127 which is connected by the link 128with the arm 129 secured onthe lower end of the vertical rock shaft i 130 journaled in suitable bearings in the framework of 1 the vehicle, and provided at its upper end with two .pedal arms 131,, and 132, set at right angles to each other in position to be thrown by the foot of the driver from the full-line position of Fig. 10 to the dotted-line position, and vice versa. A strong, helically coiled contractile spring 133 is secured at one end to the crank arm 134 also secured to the bottomiof theshaft 118, and preferably rigid withand at right angles to the arm 12?, and at the other end .to the bracket 135; securedon. the bottom of the casting 12 7 With the construction herein shown, it

will bereadily apparent that when the parts are in the full-line positions Of Figs. 9 and 10, the pull of the spring 133 on the arm 13ft will serve to push the roller 120- against the slip ring, thus holding the fly wheel in its forward position under a strong spring pressure, giving the desired friction between he peripheries of the disks 18 and 18 and the annular friction surface 17?; on the fly wheel 15 'When it-is desired to operate by direct drive, the operator pushes on vthe pedal arm 132, rocking the shaft' 130 through 90, and thereby swinging the rock shaft 118 past its centralposition so that the spring 133will now act to hold the annular surfaceil'? away from the peripheral surfaces of the disks 18 and 18*, as in the new position of the shaft 118, the roller120 is shifted; through 90, and, being eccentric, carries the flywheel backward'to the desired extent, whichneed noteXceed asmall fraction ofan. inch. VVithVthe fly wheel in the rearward position, the expanding wheel is, as before, moved' into the fly wheel and exiosf panded to clutch the annular surface-96 in V '7 which position the drive is direct, as before. When themachine is to be slowed down and driven by frictional gear, the operator presses on the pedal arm 131, throwing the parts back to the full-line position, this action, of course, being taken at the same time or after the expanding wheel has been contracted and moved back out of the fly wheel. I preferably apply the stops 136 and 137 to the floor of the bed to stop the arms 131 and 132, i

respectively, and limit the possible movement of the fly wheel given by thespring.

In .Fig. 8, I have indicated a possible design of the ends of the segments 65, in which said ends are-toothed and intermeshed so as to prevent there being continuous breaks across the peripheral surface of the expanding wheel when the same is expanded, so as to make asmoother engagement than would result from the straight breaks across the surface.

Nhile I have shown and described my invention as embodied in the form which I at present consider best adapted to carry out its purposes, it will be understood that it is capable of modificatiomand that I do not desire tobe limited in the interpretation of the following claims except as may be necessitated by the state of the prior art.

What I claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a transmission gearing, the combination with a frame, of a motor carried thereby, a driving wheel, journaled beneath said frame and driven by the motor, a driven shaft concentric with the driving wheel, a

driven wheel on said shaft, a transmission disk engaged by the wheels, mechanism for expanding and contracting the driven wheel to engage and disengage it with the transmission disk, a controlling element for said mechanism above the frame, and connections between the controlling element and the mechanism.

2. In a transmission gearing, the combination with a frame, of-a motor carried I engaged by the wheels, mechanism for expanding and contracting the driven wheel to engage and disengage it with the transmission disk, a controlling element for said mechanism above the frame, and connections between the controlling element and the mechanism.

3. In a transmission gearing, the combination with a frame, of a motor carried thereby, a driving wheel journaled beneath said frame and driven by the motor, a

driven shaft concentric with the driving 5 wheel, a driven wheel on said shaft, means for moving the driven wheel on the driven shaft to vary the speed, a transmissiondisk engaged by the wheels, mechanism for expanding and contracting the driven wheel to engage and disengage it with the transmission disk, a controlling element for said mechanism above the frame, and connections between the controlling element and the mechanism and means. a

4%. In a transmission gearing, the combination with .aframe, of a motor cal'litd,

- thereby, a drivingwheel journaled beneath by the wheels, means for moving one of said wheels transversely of the transmission disk to vary the speed, mechanism for expanding and contracting one of said wheels to engage and disengage it with the trans mission disk, a controlling element for said mechanism above the frame, and connections between the controlling element and the mechanism.

6. In a transmission gearing, the combination with a frame, of a motor carried thereby, a driving wheel journaled beneath said frame and driven bythe motor, a driven wheel, a transmission disk engaged by the wheels, means for moving one of said wheels transversely of the transmission disk to vary the speed, mechanism. for expanding and contracting one of said wheels to engage and disengage it with the transmissiondisk, acontrolling element for said mechanism above the frame, and connections between the controlling element andthe mechanism and means. I

. 7. In a transmission gearing, the combination with a frame, of a'motor carried thereby, a driving wheel journaled beneath said frame and driven by the motor, a driven wheel, a transmission'disk engaged by the wheels, means for moving one of said wheels transversely of the transmission disk to vary the speed, mechanism for expanding and contracting one of said wheels to engage and disengage it with the transmission disk, a single controlling element having two movements, above the frame, and connections between the controlling'element and the mechanism and means.

8. In a device ofthe class described, the combination with a driving wheeland an annulus carried thereby, of a transmission disk at right angles thereto, an expansible driven wheel, means to shift the driven wheel into the annulus or along the face of the transmission disk, and means for expanding said wheel to clutch it to the annulus or to engage it frictionally with the transmissiondisk at right angles thereto, an expansible along the face of the transmission disk,

means for'expandmg said drlven wheel to clutch it to the annulus or to engage it frictionally with the transmission disk, and means for separating the driving wheel and transmission disk to stop the latter when the driven wheel is clutched bythe annulus.

11. In a device of the class describechthe combination with a driving wheel and an annulus carried thereby, of a transmission disk at right angles thereto and driven thereby, an expansible driven wheel, a driven shaft upon which the driven wheel is splined, means to shift the driven wheel on the shaft into the: annulusor along the face of the transmission disk, means for expanding said Wheel to clutchit to the annulus-or to engage it frictionally with the transmission disk, and means for separating the driving wheel and transmission disk to stop the 35' wit-h the annulus.

latter when the driven wheel is clutched 12. In a transmission gearing for automobiles, the combination with two parallel tran'smissiondisks, of a driving and a driven stop the gearing, a controlling element at a distance from said means, and connections between said elementand said means where- ;by thelatter can be operated as described.

13. In a transmission gearing for automobiles, "the combination with two parallel transmissiondisks, ofa driving and a driven .Wheeladapted to engage withthe transmlssion disks, means for moving one of said j wheels acrossithe "faces of the disks to vary the speed, means'for instantly expandingor contracting one-of said wheels to start or stop the gearing, controlling elements at a distance from 'both'of said means, and connections between said elements and said :means whereby the latter can beoperated as described.

tween said disks, means for instantly exipandingor contracting. the wheelto start or stop the gearing,a controlling element at a distance from said m'eans,and connections between said element and said means whereby the latter can be-operated as described.

15. In a transmission gearing for automobiles, the combination with a pair of parallel disks, of a wheel at right angles thereto be 7 tween said disks, means for moving said wheel across the faces of the disks to vary the speed, means for instantly expanding or contracting the wheel to start or stop the gearing, controlling elements located at a distance from both of saidmeans, and connections between said elements and said means whereby described.

16. In a device ofthe class described,fthe combination with a driving wheel and an annulus carried thereby, of a pair'of parallel transmission disks at right angles thereto,

an expansible driven'wheel between'said disks, means to shift the driven wheel into the annulus or along the faces of the disks,

and means for expanding said wheel to clutch it to the annulusor to'engage it frlctionally with the transmission disks.

317. 'In a device of the class described, the combination with an expansible wheel comprising'a hub sleeve portion, asecond sleeve portion axially movable relative to the first, radially movable contact segments, and'connection between the two sleeves and seg ments so that the relative axial movement between the sleeves will causethe radial movement of the segments; of a coiiperating disk on an axis at right anglesto the axis ofthe wheel and engaged by the periphery thereof when the latter is expanded.

18. In a device of the class described, the combination with an expansible wheel comprising a hub-sleeve portion, a second sleeve portion axially movabl'e'relativeto the first,

radially movable contact segments and connections between the two sleeves. and segments so that the relative axial -movement between the sleeves will cause the radial movement ofthe segments; of a cotiperating disk on an axis at right angles to the axis ofthe wheel and engaged by the periphery thereof when the latter is expanded; and

means for shifting the position of the Wheel and disk relative to each other, the movement of the shiftedone being along the axis of the driving wheel.

combination with an expansible wheel comprising a hub sleeve portion, a second sleeve portion axially movable relative to the first,

radially movable contact segments, and connections between the two sleeves and segments so that the relative axialmovement between the sleeves will cause the radial movement of the segments; of'a cotiperating disk on an axis at right-angles to the-axis of 19. In a device of the class described, the V the latter can be operated as I the wheel and engaged by the periphery thereof when the latter is expanded; and means for moving the second sleeve portion relatively to the first.

20. In a device of the class described, the combination with an expansible wheel comprising a hub sleeve portion, a second sleeve portion axially movable relative to the first, radially movable contact segments, and connections between the two sleeves and segments so that the relative axial movement between the sleeves will cause the radial movement of the segments; of a cooperating disk on an axis at right angles to the axis of the wheel and engaged by-the periphery thereof when the latter is expanded; means for shifting the position of the wheel and disk relative to each other, the movement of the shifted one being along the axis of the wheel; and means for moving the second sleeve portion relatively to the first.

21. In a device of the class described, the combination with an expansible wheel comprising a hub sleeve portion, a second sleeve portion axially movable relatively to the first radially movable contact segments, and connections between the two sleeves and segments so that the relative axial movement between the sleeves will cause the radial movement of the segments; of a cooperating disk on an axis at right angles to the axis of the wheel and engaged by the periphery thereof when the latter is expanded; a shaft upon which said sleeve portions are splined; and means for simultaneously shifting the position of the two sleeve portions along said shaft without changing their relative positions.

22. In a device of the class described, the combination with an expansible wheel comprising a hub sleeve portion, a second sleeve portion axially movable relative to the first, radially movable contact segments, and connections between the two sleeves and segments so that the relative axial movement between the sleeves will cause the radial movement of the segments; of a cooperating disk on an axis at right angles to the axis of the wheel and engaged by the periphery thereof when the latter is expanded; a shaft upon which said sleeve portions are splined; means for shifting the position of the two sleeve portions along said shaft without changing their relative positions; and means for moving the second sleeve portion relatively to the first.

23. In a device of the class described, the combination with a shaft, of a friction disk journaled adjacent said shaft with its frietion face parallel to the axis of the shaft, an

expansible wheel splined on said shaft and composed of a hub sleeve portion, a'second sleeve portion axially movable relative to the first, radially movable contact segments,

and connections between said sleeves and segments whereby the relative axial 1novement between the sleeves will cause the radial movement of the contact segments, means for moving the hub sleeve to vary the speed, and means for moving the second sleeve to engage the wheel with the disk.

24:. In a device of the class described, the combination with a shaft, of a friction disk journaled adjacent said shaft with its friction face parallel. to the axis of the shaft, an expansible wheel splined on said shaft and composed of a hub sleeve portion, a second sleeve portion axially movable relative to the first, both of said sleeve portions having annular grooves therein, radially movable contact segments, and connections betweenrsaid sleeves and segments whereby the relative axial movement between the sleeves will cause the radial movement of the contact segments, rings in said grooves, links secured to said rings, means for moving the links connected with the hub sleeve to vary the speed, and means for moving the links connected to the second sleeve to engage the wheel with the disk.

25. In a device of the class described, the combination with a rotating driving member and an annulus carried thereby, of a transmission disk at right angles thereto and driven thereby, an expansible driven wheel, means to shift the driven wheel into the annulus or along the face of the disk, and means for expanding said wheel to clutch it to the annulus or to engage it frictionally with the disk.

26. In a device of the class described, the combination with a rotating driving member and an annulus carried thereby, of a transmission disk at right angles thereto and driven thereby, an expansible driven wheel, a driven shaft upon which the driven wheel is splined, means to slide the driven wheel on the shaft into the annulus or along the face of the disk, and means for expanding said wheel to clutch it to the annulus or to engage itfrictionally with the disk.

27. In a device of the class described, the combination with a rotating driving member and an annulus carried thereby, of a transmission disk at right angles thereto and driven thereby, an expansible driven wheel, means to shift the driven wheel into the annulus or along the face of the disk, means for expanding said wheel to clutch it to the annulus or to engage it frictionally with the disk, and means for separating the driving member and the transmission disk to stop the latter when the driven wheel is clutched with the annulus.

28, In a device of the class described, the combination with a transmission disk, of an expansible wheel, means for shifting the wheel across the face of the disk, means for expanding said wheel to engage the disk, and interlocking mechanism between said two means to prevent the shifting of the wheel while it is expanded.

29. In a device of the class described, the combination with a transmission disk, of an expansible wheel, means for shifting the Wheel across the face of the disk, means for expanding said wheel to engage the disk, a

lever controlling theshifting means, another lever controlling the expanding means, and interlocking mechanism between said two levers to prevent the shifting of the wheel while it is expanded.

30. In a device of the class described, the combination with a transmission disk, of an expansible wheel, means for shifting the wheel across the face of thedisk, means for expanding said wheel to engage the disk, a

lever controlling the shifting means, an-" other lever controlling the expandingmeans, and interlocking mechanism between said two levers to prevent the shifting of the wheel while it is expanded, said interlocking mechanism comprising a detent segment concentric with the pivots of said levers, a V

sleeve sliding on the shifting lever and having a cam slot engaging the expanding lever, and a lug carried by said sleeve engaging the teeth of the segment when the expanding lever is moved to expanding position.

31. In a device of the class described, the combination with a transmission disk, of an expansible wheel, means for shifting the wheel across the face of the disk, and means for expanding said wheel to engage the disk, said two means including a shifting lever and an expanding lever, said shifting lever carrying a sleeve'slidable thereon and hav- 7 mg a cam slot engaging with the expandlng lever to shift it as the sleeve moves.

' scribed.

33. In a transmission gearing for automobiles, the combination with a transmission disk, of a' wheel, means for moving the wheel across the face of the transmission disk, and for securing the wheel in the position to which it has been adjusted, means for instantly expanding the wheel to bring its periphery into engagement with the disk, controlling elements at a distance from both of said Imeans, and connections between said elements and said means whereby both the latter can be operated as described.

34. In atransmission gearing for automobiles, the combinationwwith atransmission disk, of a wheel, means for producing relative movement between the disk and wheel, the movement'being along the axis of the wheel, means for instantly expanding the wheel to bring its periphery' into engagement with the driven disk and holding it in said expanded position, controlling elements for each of said means at a distance therefrom, and connectionsbetaveen each of said controlling elements and the means controlled thereby, whereby the latter can be operated as described. 7 85. In a transmission gearing for automo biles, the combination with a transmission disk, of a'wheel, means forZmoving the wheel across the face of the disk, means for instantly expanding the wheel to bring its periphery into en, ;agement with the disk and holding it in said expanded position,

controlling elements for each of said means at a distance therefrom, and connections between each of said controlling elements and the means controlled thereby, whereby the latter can be operated as described.

' 86. In a transmission gearing for automobiles, the comblnation with a transmission disk, of awheel, means for producing rela tivemovement between the disk and wheel,

the movement being along the axis of the wheel, and for securmg the disk and wheel in the relativeposltions to whlch they may be adjusted, means for instantly expanding I the wheel to bring 'its periphery into engagement with the disk and holding it in the. expanded posit-i011, controlling elements for each of said means at a. CllSh21IlCQ t-l1lB from, and connections betweeneach of said controlling elements and the means controlled thereby, whereby the latter can be operated as described. v r

.37. In a device of the class described, the

combination with a transmission disk, of a coactingwheel movable bodily into and out of driving engagement with said disk, an 'expanslble wheel, means for quickly expanding and contracting said wheel to start or stop the gearing, and a spring coacting with the first wheel to hold it yieldingly in either position of adjustment. a

38. In a device of the class described, the combination with rotating shaft, of a driving wheel splined to slide thereon having an annular channel. in its hnb, a rock shaft at right angles to the rotating shaft, an ec--- centriclly mounted roller on the rock shaft 1 entering the channel, a transmission disk at arms thereon, crank arms carried by said my hand and affixed my seal, this 80th day rock shafts, a link connecting said crank of November A. D. 1910.

arms and a sol-in connected to a crank arm on the first shaft and to a stationary part JOHN HOWARD MCELROY' 5 tending to hold the rock shaft in either p0si- Vitnesses:

tion of adjustment. 7 F. E. BROM,

In witness whereof, I have hereunto set JNO. G. ELLIOTT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latentsv Washington, D. G. 

